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Ecosystems Encyclopedia Entry 1780013901

** Ecosystems are complex networks of living organisms and non-living components that interact and depend on each other in a specific environment. **CONTENT:** ### Overview An **ecosystem** is a dynamic and intricate system that consists of living organisms, such as plants, animals, and microorganisms, interacting with each other and their physical environment, including air, water, soil, and sunlight. Ecosystems can be found on land, in water, or in the air, and they vary greatly in size, from small, localized systems like a pond or a coral reef, to vast, global systems like the Amazon rainforest or the ocean. The interactions within an ecosystem are governed by the principles of **ecology**, which studies the relationships between living organisms and their environment. Ecosystems are characterized by the presence of **biotic** factors, such as plants, animals, and microorganisms, and **abiotic** factors, such as soil, water, and sunlight. The biotic factors in an ecosystem are interconnected through a web of relationships, including **food chains**, **food webs**, and **symbiotic relationships**. For example, in a forest ecosystem, trees provide shade and shelter for animals, while animals help to disperse seeds and pollinate plants. The abiotic factors in an ecosystem, such as soil and water, provide essential resources for the biotic factors, such as nutrients and water. Ecosystems are constantly changing due to natural processes, such as **succession** and **disturbance**, and human activities, such as **deforestation** and **pollution**. These changes can have significant impacts on the ecosystem, including the loss of biodiversity, changes in ecosystem function, and the degradation of ecosystem services. ### History/Background The concept of ecosystems has been studied by scientists for centuries, with early observations of the natural world dating back to ancient civilizations. However, it wasn't until the 19th century that the term "ecosystem" was first coined by **Tansley**, a British ecologist. Tansley defined an ecosystem as a "complex of living and lifeless components, interacting in a specific environment." Since then, the study of ecosystems has become a major focus of ecological research, with scientists developing new theories and models to understand the complex interactions within ecosystems. ### Key Information Ecosystems are characterized by several key features, including: * **Biodiversity**: The variety of living organisms in an ecosystem, including plants, animals, and microorganisms. * **Energy flow**: The transfer of energy from one trophic level to another through food chains and food webs. * **Nutrient cycling**: The movement of nutrients through an ecosystem, including the decomposition of organic matter and the release of nutrients. * **Ecosystem services**: The benefits that ecosystems provide to humans, including clean air and water, food, and climate regulation. Some of the most important types of ecosystems include: * **Terrestrial ecosystems**, such as forests, grasslands, and deserts. * **Freshwater ecosystems**, such as rivers, lakes, and wetlands. * **Marine ecosystems**, such as coral reefs, estuaries, and open ocean. * **Arctic and alpine ecosystems**, which are characterized by harsh, cold conditions. ### Significance Ecosystems are essential for human well-being, providing essential resources, such as food, water, and clean air, and regulating the climate. However, ecosystems are facing significant threats, including **climate change**, **deforestation**, and **pollution**. These threats can have devastating impacts on ecosystems, including the loss of biodiversity, changes in ecosystem function, and the degradation of ecosystem services. **INFOBOX:** - Name: Ecosystems - Type: Ecological system - Date: 19th century (coined by Tansley) - Location: Global - Known For: Complex networks of living organisms and non-living components that interact and depend on each other in a specific environment. **TAGS:** Ecosystems, Ecology, Biodiversity, Energy flow, Nutrient cycling, Ecosystem services, Terrestrial ecosystems, Freshwater ecosystems, Marine ecosystems, Arctic and alpine ecosystems, Climate change, Deforestation, Pollution.